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Question

Prove that the sequence, whose general term is an=2.3n, is a geometric progression and find the stint of the first eight terms.

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Solution

let an=2.3n,an+1=2.3n+1,an+2=2.3n+2
an+1an=an+2an+1=3 Clearly it is in a GP
it's first three terms are 6,18,54

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